I dumped out the bag and found what had been inside was a...

I dumped out the bag and found what had been inside was a bunched-up police uniform, complete with the vest. "Where did you get this?" Boo asked. "It's Callum's," he said. "What's he wearing?" "At the moment, not much of anything. Put it on." I noticed Book perk up a bit at this piece of information.